Coexisting ferroelectric and paraelectric phases in electron beam irradiated P(VDF-TrFE) films

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• 作者：Jae Woong Kim ; Tae Kwon Lee ; Jong Hoon Jung…
• 关键词：Electron beam irradiation ; P(VDF ; TrFE) ; Relaxor behavior ; Coexisting phases
• 刊名：Journal of the Korean Physical Society
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：69
• 期：11
• 页码：1724-1728
• 全文大小：
• 刊物主题：Physics, general; Theoretical, Mathematical and Computational Physics; Particle and Nuclear Physics;
• 出版者：The Korean Physical Society
• ISSN：1976-8524
• 卷排序：69

文摘

We report on structural, electrical, and Raman investigations of phase changes induced in P(VDF-TrFE) films by electron beam irradiation. With increasing electron beam dose, the ferroelectric β-phase is weakened because of reductions in the coercive field, remnant polarization, and Curie temperature. Finally, highly dosed (9.38 × 1016 cm−2) P(VDF-TrFE) shows a paraelectric α-phase. A Vogel-Folcher type relaxor behavior becomes strong with the decreasing freezing temperature and the increasing activation energy. From the Raman scattering measurement, we observed that both the α- and the β-phases coexist irrespective of the electron beam irradiation and that the temperature dependences of the α- and β-phases are quite different. The ratio of the intensity of the α-phase to that of the β-phase sharply increases at a certain temperature, at which polar nanoregions may disappear.